Don, cool find...around '81 I bought a Vodoo green white/white/III/M20/3.55 from the original owner. He told me he walked into the dealer wanting a GTO 'Vert to tow his....sailboat.
They sold him the car stating it had the "towing package"
Like BVZ, I've never run across a 4.33 4sp vert III car. Looking forward to the "cleaned up" pics.
Mike